The Fir Park side were without Tom Hateley due to injury and Chris Humphrey was only fit to be a substitute in Sunday's 1-1 home draw against St Mirren.
Micheal Higdon took advantage of some poor defending by Lee Mair and slotted beyond Craig Samson to open the scoring in the first minute.
St Mirren pressed for an equaliser throughout the remainder of the match and the home side's Shaun Hutchinson was dismissed in the closing stages.
In the last minute of injury-time Steven Thompson forced an excellent save from Darren Randolph before substitute Thomas Reilly bundled the ball into the net.
"Overall there was no doubt that St Mirren deserved a share of the spoils," said McCall.
"The young guys did great and it was probably one of the youngest teams that Motherwell have ever fielded.
"We are trying to strengthen the squad, I don't want to bring in players that won't improve the team, but we need bodies in."
Motherwell finished third in the SPL last season, and with Rangers no longer a factor the Steelmen are hoping for another high finish.
But McCall said: "It's proving difficult in bringing in players from England - I wouldn't hold your breath for stellar signings but we hope to bring in some squad players."
Danny Lennon is hoping his St Mirren team can build on their display.
The Paisley side battled throughout the match and earned a deserved point through Reilly's equaliser.
"It's important that we start to string these type of performances on a consistent basis," said manager Lennon.
"We can look at Motherwell and the consistency they had away from home last season and take hope from that - it was so important in them qualifying for Europe.
"Our response to the early goal was top drawer, we make no mistake of the way we want to go about the game and when you do that you will take risks.
"We certainly deserved something from the game, there's no doubt about it, we are delighted for Thomas Reilly, it's very much a club where the older lads help the younger lads."